Air-cooled silencer with plural passages



Dec. 26, 1950 w N 2,535,660

AIR-COOLED SILENCER WITH PLURAL PASSAGES Filed Oct. 16, 1947 -H P x 1 Patented Dec. 26, l950 assasso AIR-ooo EnsmENcER. WITH PLURAL PASSAGES.

Ernest Wynn, Thornton, Bradford, England Application October 16, "roirserial No. 780,112

In Great Britain October 24,1946:

1 Claim. totin -4s) The invention relates to exhaust silencers for internal-combustion engines, and has for its object to devise new or improved constructions thereof which enable the exhaust gases from engines to be broken up, cooled, distributed and exhausted in a simple and efficient manner.

By the use of the invention back-pressure in the exhaust systems of engines is eliminated, economy of fuel is eiiected, and accessibility of the several parts is so easy that thorough cleansing of the interior of the silencers may be quickly effected with a minimum of effort.

According to the invention the improved exhaust silencer comprises a casing provided with inlet and outlet ends each having an opening, pipe or pipes therein for ingress and egress of exhaust gases, an intervening partition member dividing the casing interior into a cooling chamber and a spent gas chamber, and a plurality of distribution or expansion pipes or tubes within the cooling chamber associated with the aforesaid inlet opening, pipe or pipes, the outer ends of said distributing pipes opening into the spent gas chamber. An opening or openings may be formed in the inlet end of the silencer for ingress of air to the cooling chamber. Alternatively, an opening or openings in the inlet end and in the partition member permits ingress and egress of air to and from the aforesaid cooling chamber.

The outer ends of the distributing pipes are preferably reduced, jet-shaped, tapered, or they may be perforated, and the exhaust end of the device may be detachably secured to the casing to facilitate cleansing of the casing interior. Furthermore, the front end of the silencer may be provided with a peripheral flange for accentuating entry of air to the cooling chamber.

In order that the invention may be fully and clearly comprehended, it will now be described with reference to the accompanying drawing, in which- Figure 1 is a sectional side elevation of an exhaust silencer constructed according to the invention.

Figure 2 is an end view of the inlet end of the exhaust silencer, that is, looking from the right of Figure 1.

Figure 3 is a sectional end view on the line IIIIII of Figure 1.

The exhaust silencer comprises a cylindrical casing A having an integral inset end wall B and a detachably mounted conical shaped end C terminating in an exhaust outlet pipe D, a gasket ring F being interposed between portions A and C.

The interiorof' the casing A is divided by a partition member G into two compartments H and J, the first compartment serving as a cooling chamber and the latter as a spent gas chamber.

An inlet pipe K secured to the end wall B is formed integral with or connected to a plurality of distributing or expansion pipes L, M, N, within the cooling chamber H, the outer ends of said pipes projecting through partition G into the spent gas chamber J and to have reduced or jetshaped ends.

In end plate B are formed a number of slots or orifices O, and similar slots or orifices P are provided in partition G.

In practice, the inlet pipe K is secured to the customary exhaust pipe of an internal-combustion engine in the usual manner. During operation of the engine the exhaust gases therefrom enter the silencer through p pe K and are broken up, cooled and distributed by the expansion pipes L, M, N, said gasees subsequently passing out of the jet ends of the pipes into the spent gas chamber J, whence they escape to atmosphere.

The expansion pipes L, M, N, within the cooling chamber H are kept cool by a circulation of a r which enters through orifices O and passes out through orifices P into the spent gas chamber J where it commingles with the exhaust gases and passes away via the exhaust pipe D.

When the improved exhaust silencer is fitted to the engine exhaust pipe of an automobile or other vehicle, movement of the latter causes an inrush of air into chamber H through orifices O which passes through orifices P into the spent gas chamber J and swiftly and effectively scours the spent gases from the latter chamber through the exhaust pipe D. The peripheral flange S formed by the casing A and inset end B acts during motion of a vehicle to induce or direct atmospheric air to the interior of the chamber H by way of orifices P and thus facilitates cooling of the pipes L, M, N, and consequently of the exhaust gases.

In a modification of the invention, the interior wall of the spent gas chamber J may be lined with asbestos or similar material, in the manner illustrated at X in Figure 1 of the drawing.

The improved silencer is preferably constructed and arranged in such a manner that any or all of the several parts may be readily disconnected for enabling the interior to be cleansed, and any suitable appropriate means may be associated therewith for mounting and securing the device in position upon an engine, vehicle or other object.

Having described the invention, what is claimed is:

An exhaust silencer for internal-combustion engines, comprising a cylindrical casing having an axially arranged inlet pipe at one end and a similarly arranged outlet pipe at the opposite end, an intervening partition member disposed within said casing and dividing it into a cooling chamber and a spent gas chamber, the latter chamber being lined with heat-resisting material, a plurality of exhaust-gas distributing pipes within the cooling chamber, the inlet ends of said pipes merging into a single pipe in communication with the aforesaid'inlet pipe and the partition member being provided with openings for permitting the passage of air from the cooling chamber to the spent gas chamber."

, ERNEST WYNN. 20

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 700,785 Kull May 27, 1902 1,077,905 Dewey Nov. 4, 1913 1,357,079 Patch Oct. 26, 1920 1,811,762 Schnell June 23, 1931 1,892,009 Sagui Dec. 27, 1932 2,033,784 Pougher Mar. 10, 1936 FOREIGN PATENTS I Number Country Date France Aug. 19, 1932 

